numpy.format_float_positional

numpy.format_float_positional(x, precision=None, unique=True, fractional=True, trim='k', sign=False, pad_left=None, pad_right=None)[source]

Format a floating-point scalar as a decimal string in positional notation.

Provides control over rounding, trimming and padding. Uses and assumes IEEE unbiased rounding. Uses the “Dragon4” algorithm.

Parameters
xpython float or numpy floating scalar

Value to format.

precisionnon-negative integer or None, optional

Maximum number of digits to print. May be None if unique is True, but must be an integer if unique is False.

uniqueboolean, optional

If True, use a digit-generation strategy which gives the shortest representation which uniquely identifies the floating-point number from other values of the same type, by judicious rounding. If precision was omitted, print out all necessary digits, otherwise digit generation is cut off after precision digits and the remaining value is rounded. If False, digits are generated as if printing an infinite-precision value and stopping after precision digits, rounding the remaining value.

fractionalboolean, optional

If True, the cutoff of precision digits refers to the total number of digits after the decimal point, including leading zeros. If False, precision refers to the total number of significant digits, before or after the decimal point, ignoring leading zeros.

trimone of ‘k’, ‘.’, ‘0’, ‘-‘, optional

Controls post-processing trimming of trailing digits, as follows:

  • ‘k’ : keep trailing zeros, keep decimal point (no trimming)

  • ‘.’ : trim all trailing zeros, leave decimal point

  • ‘0’ : trim all but the zero before the decimal point. Insert the zero if it is missing.

  • ‘-‘ : trim trailing zeros and any trailing decimal point

signboolean, optional

Whether to show the sign for positive values.

pad_leftnon-negative integer, optional

Pad the left side of the string with whitespace until at least that many characters are to the left of the decimal point.

pad_rightnon-negative integer, optional

Pad the right side of the string with whitespace until at least that many characters are to the right of the decimal point.

Returns
repstring

The string representation of the floating point value

See also

format_float_scientific

Examples

>>> np.format_float_positional(np.float32(np.pi))
'3.1415927'
>>> np.format_float_positional(np.float16(np.pi))
'3.14'
>>> np.format_float_positional(np.float16(0.3))
'0.3'
>>> np.format_float_positional(np.float16(0.3), unique=False, precision=10)
'0.3000488281'
numpy.array_str numpy.format_float_scientific